User guide

BATTERY REPLACEMENT
Battery powered monitors use a single 1.5V, D size alkaline battery. When replacement is necessary, use a clean fresh battery
to ensure continued trouble-free operation. It is recommended that the total be saved to memory before the battery is
removed.
DO NOT OPEN EXPLOSION PROOF ENCLOSURE UNLESS THE AREA IS KNOWN TO BE FREE OF HAZARDS. FAILURE
TO MAKE THE AREA SAFE BEFORE OPENING THE ENCLOSURE CAN RESULT IN A HAZARDOUS SITUATION WITH A
POTENTIAL FOR INJURY.
Carefully unscrew the enclosure cover to access the circuit board. Remove the four screws securing the circuit board to
the enclosure. Lay the circuit board to the side, being careful not to pull any wires from their connections. Clip the battery
retaining wire/strap and remove the battery. Replace the battery, being sure to observe the proper polarity and install a new
retaining strap or wire. Reassemble the monitor reversing the disassembly process.
MAINTENANCE
ALWAYS DISCONNECT PRIMARY POWER SOURCE BEFORE OPENING ENCLOSURE FOR INSPECTION OR SERVICE.
1. Frequent inspection should be made. A schedule for maintenance checks should be determined by the environment and
frequency of use. It is recommended that it should be inspected at least once a year.
2. Perform visual, electrical and mechanical checks on all components on a regular basis.
a. Visually check for undue heating evidenced by discoloration of wires or other components, damaged or worn parts, or
leakage evidenced by water or corrosion in the interior.
b. Electrically check to make sure that all connections are clean and tight, and that the device is operating correctly.
ADDITIONAL SCALING PARAMETERS
This information is supplied as a general introduction to the basic concepts used to scale rate displays. The applicability of the
information is dependent on the type and capabilities of the specific display/monitor used.
Flow meters producing an electronic signal are normally supplied in one of two output formats. The pulse format generates
some form of alternating signal that can be raw, that is no amplification or wave shaping can be done prior to transmission to
the readout. The output pulse rate is related proportionally to flow rate. Pulses can also be modified to produce higher output
amplitudes or specific wave shapes.
The other output format is an analog signal. This is a continuous, variable voltage or current signal that is normally scaled to
the dynamic range of the meter. Typical analog signals are 0…5V DC, 0…10V DC, and 4-20 mA. The analog signals may or may
not be derived from a raw pulse signal produced by the flow meter.
Scaling for any of these input signals always requires at least two scaling points for a linear process – zero or minimum flow
point and the maximum flow point. Additionally, each scaling point has two components, the actual input signal value and
the desired display value at that input signal for that scaling point.
For example, a pulse output flow meter has a flow of 50 gpm at a pulse rate of 100 Hz. The actual input signal is the 100 Hz
figure, but allowing the display to read 100 would be meaningless to the operator. The solution to this problem is to scale the
display to read 50 (gpm) when the input is 100 Hz.
Flow Monitor, B2800XP Explosion Proof Monitor – Advanced
Page 16 November 2013